tracing: probes: Fix to zero initialize a local variable

BugLink: https://bugs.launchpad.net/bugs/2097575

commit 0add699ad068d26e5b1da9ff28b15461fc4005df upstream.

Fix to initialize 'val' local variable with zero.
Dan reported that Smatch static code checker reports an error that a local
'val' variable needs to be initialized. Actually, the 'val' is expected to
be initialized by FETCH_OP_ARG in the same loop, but it is not obvious. So
initialize it with zero.

Link: https://lore.kernel.org/all/171092223833.237219.17304490075697026697.stgit@devnote2/

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/b010488e-68aa-407c-add0-3e059254aaa0@moroto.mountain/
Fixes: 25f00e40ce79 ("tracing/probes: Support $argN in return probe (kprobe and fprobe)")
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

This commit is contained in:

Masami Hiramatsu (Google)

2024-03-20 17:10:38 +09:00

committed by

Stefan Bader

parent 9626e9a3a7

commit 4b4348287b

1 changed files with 1 additions and 1 deletions

									
										kernel/trace/trace_probe.c
									
		+1
		-1
	
												View File
												
				@@ -843,7 +843,7 @@ out:

				void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs)

				{

					struct probe_entry_arg *earg = tp->entry_arg;

					unsigned long val;

					unsigned long val = 0;

					int i;

					if (!earg)